| /* |
| * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.lir.alloc.lsra; |
| |
| import static org.graalvm.compiler.core.common.GraalOptions.DetailedAsserts; |
| import static org.graalvm.compiler.lir.LIRValueUtil.isJavaConstant; |
| import static org.graalvm.compiler.lir.LIRValueUtil.isStackSlotValue; |
| import static org.graalvm.compiler.lir.LIRValueUtil.isVariable; |
| import static org.graalvm.compiler.lir.LIRValueUtil.isVirtualStackSlot; |
| import static jdk.vm.ci.code.ValueUtil.isIllegal; |
| |
| import java.util.Collections; |
| import java.util.EnumSet; |
| import java.util.List; |
| |
| import org.graalvm.compiler.core.common.cfg.AbstractBlockBase; |
| import org.graalvm.compiler.debug.Debug; |
| import org.graalvm.compiler.debug.Indent; |
| import org.graalvm.compiler.lir.ConstantValue; |
| import org.graalvm.compiler.lir.InstructionValueProcedure; |
| import org.graalvm.compiler.lir.LIRFrameState; |
| import org.graalvm.compiler.lir.LIRInstruction; |
| import org.graalvm.compiler.lir.LIRInstruction.OperandFlag; |
| import org.graalvm.compiler.lir.LIRInstruction.OperandMode; |
| import org.graalvm.compiler.lir.StandardOp; |
| import org.graalvm.compiler.lir.StandardOp.MoveOp; |
| import org.graalvm.compiler.lir.StandardOp.ValueMoveOp; |
| import org.graalvm.compiler.lir.Variable; |
| import org.graalvm.compiler.lir.gen.LIRGenerationResult; |
| import org.graalvm.compiler.lir.phases.AllocationPhase; |
| |
| import jdk.vm.ci.code.TargetDescription; |
| import jdk.vm.ci.meta.AllocatableValue; |
| import jdk.vm.ci.meta.Value; |
| |
| /** |
| * Phase 7: Assign register numbers back to LIR. |
| */ |
| public class LinearScanAssignLocationsPhase extends AllocationPhase { |
| |
| protected final LinearScan allocator; |
| |
| public LinearScanAssignLocationsPhase(LinearScan allocator) { |
| this.allocator = allocator; |
| } |
| |
| @Override |
| protected void run(TargetDescription target, LIRGenerationResult lirGenRes, AllocationContext context) { |
| assignLocations(); |
| } |
| |
| /** |
| * Assigns the allocated location for an LIR instruction operand back into the instruction. |
| * |
| * @param op current {@link LIRInstruction} |
| * @param operand an LIR instruction operand |
| * @param mode the usage mode for {@code operand} by the instruction |
| * @return the location assigned for the operand |
| */ |
| protected Value colorLirOperand(LIRInstruction op, Variable operand, OperandMode mode) { |
| int opId = op.id(); |
| Interval interval = allocator.intervalFor(operand); |
| assert interval != null : "interval must exist"; |
| |
| if (opId != -1) { |
| if (DetailedAsserts.getValue()) { |
| AbstractBlockBase<?> block = allocator.blockForId(opId); |
| if (block.getSuccessorCount() <= 1 && opId == allocator.getLastLirInstructionId(block)) { |
| /* |
| * Check if spill moves could have been appended at the end of this block, but |
| * before the branch instruction. So the split child information for this branch |
| * would be incorrect. |
| */ |
| LIRInstruction instr = allocator.getLIR().getLIRforBlock(block).get(allocator.getLIR().getLIRforBlock(block).size() - 1); |
| if (instr instanceof StandardOp.JumpOp) { |
| if (allocator.getBlockData(block).liveOut.get(allocator.operandNumber(operand))) { |
| assert false : String.format( |
| "can't get split child for the last branch of a block because the information would be incorrect (moves are inserted before the branch in resolveDataFlow) block=%s, instruction=%s, operand=%s", |
| block, instr, operand); |
| } |
| } |
| } |
| } |
| |
| /* |
| * Operands are not changed when an interval is split during allocation, so search the |
| * right interval here. |
| */ |
| interval = allocator.splitChildAtOpId(interval, opId, mode); |
| } |
| |
| if (isIllegal(interval.location()) && interval.canMaterialize()) { |
| assert mode != OperandMode.DEF; |
| return new ConstantValue(interval.kind(), interval.getMaterializedValue()); |
| } |
| return interval.location(); |
| } |
| |
| /** |
| * @param op |
| * @param operand |
| * @param valueMode |
| * @param flags |
| * @see InstructionValueProcedure#doValue(LIRInstruction, Value, OperandMode, EnumSet) |
| */ |
| private Value debugInfoProcedure(LIRInstruction op, Value operand, OperandMode valueMode, EnumSet<OperandFlag> flags) { |
| if (isVirtualStackSlot(operand)) { |
| return operand; |
| } |
| int tempOpId = op.id(); |
| OperandMode mode = OperandMode.USE; |
| AbstractBlockBase<?> block = allocator.blockForId(tempOpId); |
| if (block.getSuccessorCount() == 1 && tempOpId == allocator.getLastLirInstructionId(block)) { |
| /* |
| * Generating debug information for the last instruction of a block. If this instruction |
| * is a branch, spill moves are inserted before this branch and so the wrong operand |
| * would be returned (spill moves at block boundaries are not considered in the live |
| * ranges of intervals). |
| * |
| * Solution: use the first opId of the branch target block instead. |
| */ |
| final LIRInstruction instr = allocator.getLIR().getLIRforBlock(block).get(allocator.getLIR().getLIRforBlock(block).size() - 1); |
| if (instr instanceof StandardOp.JumpOp) { |
| if (allocator.getBlockData(block).liveOut.get(allocator.operandNumber(operand))) { |
| tempOpId = allocator.getFirstLirInstructionId(block.getSuccessors()[0]); |
| mode = OperandMode.DEF; |
| } |
| } |
| } |
| |
| /* |
| * Get current location of operand. The operand must be live because debug information is |
| * considered when building the intervals if the interval is not live, colorLirOperand will |
| * cause an assert on failure. |
| */ |
| Value result = colorLirOperand(op, (Variable) operand, mode); |
| assert !allocator.hasCall(tempOpId) || isStackSlotValue(result) || isJavaConstant(result) || !allocator.isCallerSave(result) : "cannot have caller-save register operands at calls"; |
| return result; |
| } |
| |
| private void computeDebugInfo(final LIRInstruction op, LIRFrameState info) { |
| info.forEachState(op, this::debugInfoProcedure); |
| } |
| |
| private void assignLocations(List<LIRInstruction> instructions) { |
| int numInst = instructions.size(); |
| boolean hasDead = false; |
| |
| for (int j = 0; j < numInst; j++) { |
| final LIRInstruction op = instructions.get(j); |
| if (op == null) { |
| /* |
| * this can happen when spill-moves are removed in eliminateSpillMoves |
| */ |
| hasDead = true; |
| } else if (assignLocations(op)) { |
| instructions.set(j, null); |
| hasDead = true; |
| } |
| } |
| |
| if (hasDead) { |
| // Remove null values from the list. |
| instructions.removeAll(Collections.singleton(null)); |
| } |
| } |
| |
| /** |
| * Assigns the operand of an {@link LIRInstruction}. |
| * |
| * @param op The {@link LIRInstruction} that should be colored. |
| * @return {@code true} if the instruction should be deleted. |
| */ |
| protected boolean assignLocations(LIRInstruction op) { |
| assert op != null; |
| |
| InstructionValueProcedure assignProc = (inst, operand, mode, flags) -> isVariable(operand) ? colorLirOperand(inst, (Variable) operand, mode) : operand; |
| // remove useless moves |
| if (op instanceof MoveOp) { |
| AllocatableValue result = ((MoveOp) op).getResult(); |
| if (isVariable(result) && allocator.isMaterialized(result, op.id(), OperandMode.DEF)) { |
| /* |
| * This happens if a materializable interval is originally not spilled but then |
| * kicked out in LinearScanWalker.splitForSpilling(). When kicking out such an |
| * interval this move operation was already generated. |
| */ |
| return true; |
| } |
| } |
| |
| op.forEachInput(assignProc); |
| op.forEachAlive(assignProc); |
| op.forEachTemp(assignProc); |
| op.forEachOutput(assignProc); |
| |
| // compute reference map and debug information |
| op.forEachState((inst, state) -> computeDebugInfo(inst, state)); |
| |
| // remove useless moves |
| if (op instanceof ValueMoveOp) { |
| ValueMoveOp move = (ValueMoveOp) op; |
| if (move.getInput().equals(move.getResult())) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @SuppressWarnings("try") |
| private void assignLocations() { |
| try (Indent indent = Debug.logAndIndent("assign locations")) { |
| for (AbstractBlockBase<?> block : allocator.sortedBlocks()) { |
| try (Indent indent2 = Debug.logAndIndent("assign locations in block B%d", block.getId())) { |
| assignLocations(allocator.getLIR().getLIRforBlock(block)); |
| } |
| } |
| } |
| } |
| } |
